Smart SDR Griffin PowerMate PTT latency.

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  • Problem
  • Updated 3 years ago
  • Solved

I have just purchased a BT Griffin PowerMate, as for me one of the biggest downsides of SmartSDR iOS was the ability to easily and quickly fine tune and the need to use the PTT on screen if VOX wasn't used (I don't get on with VOX).

The tuning seems to work quite well but I find the latency for the PTT to be far too great to be usable. Does anybody else have experience with the Bluetooth Griffin PowerMate and SmartSdr iOS.

Also once the device is connected I can go back to the griffin setup screen within SSDR iOS and it often says "Connecting" rather than "Connected" but appears to be working OK.

Any help or comments gratefully received, before I decide if I will send the Griffin PM back.

Andy M5ZAP
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Andy M5ZAP

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Posted 3 years ago

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Marcus - DL8MRE

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Official Response
Hi again Andy,

and now, regarding the Griffin.

I was able to optimize the Latency a bit but, if you try yourself, you will find that the OS X Version has exactly the problem I was talking about. For instance, if you use the button to mute/unmute volume on OS X. It sometimes toggles immediately back and sometimes it works. The Griffin sometimes generates more than one "key-press" shortly after another. This was, why I added some software de-bouncing to the button. The de-bouncing was using a 300ms delay which was probably a bit too 'conservative'. A 100ms delay was too quick. With this, in several tests, I ran into the issue that the button was reported as pressed twice which wasn't the case. A value of 200ms seem to give the best results.

In the next update, I am using this value of 200ms.